Electrical connection of devices incorporating multiple liquid crystal cells

• US 5,450,222 A
• Filed: 05/27/1993
• Issued: 09/12/1995
• Est. Priority Date: 05/27/1993
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: Apple Computer Incorporated (Apple Inc.)
• Inventors: Sirkin, Eric R.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Parker, Kenneth
• Application Number:
  US08/068,022
• Time in Patent Office: 838 Days
• Field of Search: 359/88, 359/53, 359/83
• US Class Current: 349/150
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: H05K 1/14 Structural association of two or more printed circuits providing electric connection to or between printed circuits H05K1/11, H01R12/00
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A method for connecting liquid crystal shutters. Multiple flat panel display cells each having opposed active and common substrates are fixed in overlapping relation to one another with each of the active and common substrates having multiple electrodes defined thereon. Multiple heat seal connectors are provided each having conductive paths defined thereon. Each heat seal connector is connected to one of the active and common substrates. Multiple ones of the heat seal connectors are connected to the same printed circuit, which may have a terminating header connector. Connections to a display of the type described are made by placing a display cell in a heat sealing machine, placing a heat seal connector over an edge of an active substrate of the display cell, bringing a heat fixture into contact with the heat sealing connector to heat seal the connector to the substrate, turning over the display cell and replacing the display cell in the heat sealing machine, placing the heat seal connector over an edge of a common substrate of the display cell, bringing a heat fixture into contact with the heat seal connector to heat seal the connector to the substrate, and repeating the foregoing steps for one or more additional display cells. Multiple display cells are then fixed in overlapping relation to one another.

Claims

1. A method of making connections to a display apparatus including a plurality of flat panel display cells each having opposed active and common substrates, each of the active and common substrates having a plurality of electrodes defined thereon, the method comprising the steps of:

a) placing one of the display cells in a heat sealing machine;

b) placing a heat seal connector over an edge of one of an active substrate and a common substrate of the display cell;

c) bringing a heat fixture into contact with the heat sealing connector to heat seal the connector to the substrate;

d) turning over the display cell and replacing the display cell in the heat sealing machine;

e) placing a heat seal connector over an edge of a different one of said active and said common substrate of the display cell;

f) bringing a heat fixture into contact with the heat seal connector to heat seal the connector to the substrate;

g) repeating steps a) through f) for remaining display cells;

h) fixing said display cells in overlapping relation to one another;

i) heat sealing to a first printed circuit a heat seal connector sealed to the active substrate of one display cell and a heat seal connector sealed to the common substrate of another display cell; and

j) heat sealing to a second printed circuit a heat seal connector sealed to the active substrate of said another display cell and a heat seal connector sealed to the common substrate of said one display cell.

2. An apparatus comprising:

a plurality of fiat panel display cells each comprising opposed active and common substrates, said flat panel display cells being fixed in overlapping relation to one another, each of said active and common substrates having a first edge and a second opposite edge and having a plurality of electrodes defined thereon extending between an area adjacent said first edge and an area adjacent said second edge;

first printed circuit means connected to connector means having conductive paths which connect to an active substrate of one of said flat panel display cells and to connector means having conductive paths which connect to a common substrate of another of said flat panel display cells; and

second printed circuit means connected to connector means having conductive paths which connect to an active substrate of said another of said flat panel display cells and to connector means having conductive paths which connect to a common substrate of said one of said fiat panel display cells.

3. The apparatus of claim 2, wherein one of said printed circuit means is connected to a heat seal connector means of said first type connected along said first edge and a heat seal connector means of said second type connected along said first edge.

4. The apparatus of claim 3, wherein another one of said printed circuit means is connected to a heat seal connector means of said first type connected along said second edge and a heat seal connector means of said second type connected along said second edge.

5. The apparatus of claim 2, wherein each of said heat seal connector means of said first type comprises a plurality of conductive paths equal in number to said plurality of electrodes.

6. The apparatus of claim 5, wherein each of said heat seal connector means of said second type comprises only a single conductive path.

7. The apparatus of claim 2, wherein each of said connector means comprises heat seal connector means.

8. The apparatus of claim 7, wherein each of said plurality of heat seal connector means is of one of a first type of heat seal connector means having a first pattern of one or more conductive paths and a second type of heat seal connector means having a second pattern of one or more conductive paths.

9. The apparatus of claim 8, wherein each heat seal connector means of said first type is connected to one of said active substrates along one of said first and second edges and each heat seal connector means of said second type is connected to one of said common substrates along one of said first and second edges.

10. The apparatus of claim 9, wherein each of said plurality of printed circuit means is connected to at least one heat seal connector means of said first type and at least one heat seal connector of said second type.

11. The apparatus of claim 10, wherein each of said plurality of printed circuit means has a same pattern of conductive paths defined thereon and each is provided with a header for connecting to control circuitry.

12. The apparatus of claim 2, wherein each of said plurality of printed circuit means has a same pattern of conductive paths defined thereon and each is provided with a header for connecting to control circuitry.